Plot Person-Item Map (Wright Map)

Displays a Wright map showing the joint distribution of person abilities and item difficulties on a common logit scale. Useful for identifying gaps in item coverage. Requires ggplot2.

Usage

dpmirt_plot_wright_map(fit, bins = 30, item_labels = NULL, ...)

Arguments

fit

A dpmirt_fit object from dpmirt.

bins

Integer. Number of histogram bins. Default: 30.

item_labels

Optional character vector of item labels.

...

Currently unused.

Value

A ggplot object.

See also

plot.dpmirt_fit, dpmirt_plot_items

Other visualization: dpmirt_plot_caterpillar(), dpmirt_plot_clusters(), dpmirt_plot_density(), dpmirt_plot_density_compare(), dpmirt_plot_dp_density(), dpmirt_plot_icc(), dpmirt_plot_info(), dpmirt_plot_items(), dpmirt_plot_parameter_trace(), dpmirt_plot_pp_check(), dpmirt_plot_trace(), plot.dpmirt_estimates(), plot.dpmirt_fit(), plot.dpmirt_sim()

Examples

if (FALSE) { # \dontrun{
sim <- dpmirt_simulate(200, 20, model = "rasch", seed = 42)
fit <- dpmirt(sim$response, model = "rasch", prior = "normal",
              niter = 5000, nburnin = 1000, seed = 123)
dpmirt_plot_wright_map(fit)
} # }